单词 | window |
释义 | window 1 A band of electromagnetic wavelengths that is able to pass through a particular medium with little reflection or absorption. For example, there is a radio window in the atmosphere allowing radio waves of wavelengths 5 mm to 30 m to pass through. This radio window enables radio telescopes to be used on the surface of the earth. 2 A period of time during which an event may occur in order to achieve a desired result. For example a launch window is the period during which a space vehicle must be launched to achieve a planned encounter. |
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